Paint sprayer



Feb. 21, 1956 D. LOE

PAINT SPRAYER Filed Dec. 28, 1953 INVENTOR.

DAN LOE MQW HTToeA/EY- United States Patent PAINT SPRAYER Dan Loe, Simi,Calif. Application December 28, 1953, Serial No. 400,396

3 Claims. c1. 299-86) This invention relates to a paint sprayer andparticularly to such a device which is used in connection with airpressure to apply paint to a surface. After application to the surface,the paint is further spread with a conventional paint brush.

It is an object of my invention to provide a paint sprayer of the classdescribed which sprays the paint onto the surface in solid form and notin a fog, as is conventional with pressure paint sprayers. At thepresent time, air and paint are mixed under pressure to provide a finespray. This not only strikes the painting surface, but also spreads intothe atmosphere where it contacts other surfaces, which is undesirable.With my invention, the paint is diffused into small particles, but isnot broken down into a fog.

It is a further object of my invention to provide a paint sprayer of theclass described which will spread the paint over a wider surface than isordinarily possible with conventional paint sprayers, so that paint canbe applied While less work remains to be done to spread the paint afterits application.

My invention also comprises such other objects, advantages andcapabilities as will later more fully appear and which are inherentlypossessed by my invention.

While I have shown in the accompanying drawings and described herein apreferred embodiment of my invention, it should be understood that thesame is susceptible of modification and change without departing fromthe spirit of my invention.

Referring to the drawings,

Fig. 1 is a vertical sectional view of my paint sprayer with some partsleft in elevation;

Fig. 2 is an end view of my paint sprayer;

Fig. 3 is an enlarged detailed sectional view of the parts enclosed bycircle 3 of Fig. 1;

Fig. 4 is a vertical sectional view taken on line 4-4 of Fig. 3;

Fig. 5 is an elevational view with parts in section taken on line 5 ofFig. 3;

Fig. 6 is a perspective view partly broken away of the modification ofmy shield.

A preferred embodiment which has been selected to illustrate myinvention comprises an air blower tube 10, which is attached to an airhose 11 which in turn leads to a blower which is not shown in thedrawings. A paint hose 12 is positioned adjacent the air hose 11 andleads to a pressure tank which is also not shown in the drawings. Theair blower and pressure tank which are not shown may be any conventionaldevice.

A paint valve 13 comprises a plunger 14, which is adapted to bedepressed by the painter. Plunger 14 is normally held in upward positionby a coil spring 15. When so held, paint cannot pass through the valve13, but is blocked by the bottom of the plunger 14. When the plunger14is moved downwardly against the pressure of coil spring 15, the paththrough the paint valve 13 is 2,735,719 aten ed Feb 21., 956

2 open d a pa nt mo es throu h th valve o a paint spraying tip 16.

and forwardly at a slight angle and which extends over an are which mayvary from a small arc to a large arc of 180 or more. Arcs of and havebeen successfully used. For purposes of illustration, an arc of 180 hasbeen shown in the drawings.

When the paint moves out of the slit 18, it is struck by air which ismoving outwardly through the air blower tube 10 under pressure from theblower. The particles of paint are forcibly carried to the paintingsurface, covering a substantial area.

In order to prevent any background movement of the paint and tofacilitate spraying the paint over a wide area, a shield 1801 may bemounted on the spraying tip 16 directly behind the paint outlet 17. Ascrew threaded nut 19 holds the shield 18a in place on the spraying tip16. The shield 18a prevents air from contacting the paint as soon as itleaves the slit 18 and assures that the paint is diffused over a widearea before it is propelled by the air toward the surface being painted.

In operation, the painter connects the paint hose to the pressure tankand then starts the blower. The paint spraying tip 16 is then moved topainting position. When the plunger 14 is moved downwardly by manualpressure, the paint moves through the valve 13 into the spraying tip 16and out through the slit 18 into the path of air passing through aconical section 20 defining an open end of the air blower tube 10, whichair forces the paint against the surface being painted.

It should be noted that with my invention, a fine screen or film ofpaint is provided across the diameter of the air blower tubetransversely to the movement of the air therethrough, so that the paintis easily blown onto a wide area of the surface being painted. The paintremains, however, in a more substantial form than a fog and does notspread through the air to fall on other surfaces than the surface beingpainted.

Referring to Fig. 1 of the drawings, this shows one form of my shield18a. Referring to Fig. 6 of the drawings, this shows a modified form ofmy shield in which the shield 18a is provided with a circumferentialflange which projects forwardly from the shield. The type of flange usedin practice depends largely on the type of paint being used and itsaction in the sprayer.

I claim:

1. In a paint sprayer having a source of paint under pressure and an airblower, a valve connected on one side to said paint source, said valvebeing manually operable to permit the flow of paint therethrough, an airblower tube having an open end connected to said air blower, asubstantially cylindrical paint spraying tip connected to the other sideof said valve, said tip being disposed within said air blower tubeadjacent said open end, said tip being closed except for a paint outletcomprising a slit extending downwardly and slightly forwardly from thehorizontal axis of said tip adjacent the end thereof, said slitcomprising an are extending around part of the circumference of saidtip, said valve adapted to permit paint to flow through said valve intosaid paint tip and out said paint outlet into the stream of air flowingthrough said air blower tube to be blown against the painting surfaceover a wide area.

2. The subject matter of claim 1, in which said slit has an are which isgreater than 45 3. In a pressure paint spraying device, a paint sprayingtip connected at one end to a source of pressure paint supply and closedat its opposite end, said tip having a paint outlet extending downwardlyand slightly forward from the longitudinal axis of said tip, said paintoutlet comprising a slit forming a substantial are around thecircumference of said tip, an air blower tube having an open endconnected at one end to an air blower, said tip being so positioned withrespect to said tube that said paint outlet provides a spray of paintextending transversely into the stream of air flowing out of said tubethrough said open end.

References Cited in the file of this patent UNITED STATES PATENTS HarmanOct. 30, 1883 Bohme Jan. 21, 1913 Bishop Sept. 1, 1936 FOREIGN PATENTSGreat Britain Aug. 11, 1932

